JP2003237033A - Control method and control unit of gravure printing press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method not allowing the phase operation of a printing roll to interfere with printing of a rear stage in a sectional drive type gravure printing press containing no compensator roll. <P>SOLUTION: The control method is adapted to the sectional drive type gravure printing press. The tension fluctuations of a printing substrate material due to the operation of a plate phase accompanied by the register adjustment of a printing substrate material of a certain stage and the register error corresponding thereto, that is, the model of the plate phase is constituted to perform simulation and feed forward compensation is applied to the printing control of the printing unit of a rear stage on the basis of the simulation result to eliminate the interference with the effect on the printing unit of the rear stage. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure printing machine, and more particularly to a control method and control apparatus for a sectional drive type gravure printing machine having no compensator roll.

[0002]

2. Description of the Related Art Gravure printing, as shown in FIG.
This is a printing method in which a gravure ink 103 is directly transferred from a plate cylinder 101 having a concave plate surface to a printing substrate (hereinafter referred to as substrate) 102 such as paper or a plastic film. 104
Is an impression cylinder, and 105 is a doctor blade.

FIG. 11 shows a simplified diagram of a plate cylinder portion of a gravure printing machine. Each plate cylinder 1U in the first to third printing units
Dryers 111 to 113 and cooling rolls 114 to 116 are arranged for each color on the output side of 3U. The substrate 110 printed by the first printing unit is dried by the warm air of the dryer 111, and sent to the second printing unit while being cooled by the cooling roll 114. And
The mark sensor 11 provided on the print-out side for the second and subsequent colors
7, 118 detects the printing registration of the base material 110, and detects the registration error with respect to the preceding-stage printing unit.

The printing control of the gravure printing machine controls the relative position between the two colors with respect to the printing position of the preceding stage, and the printing position is controlled by operating the path length with respect to the preceding stage. Specifically, as shown in FIG. 11, the compensator rolls 119 and 120 are provided on the entrance side of the plate cylinder of the second and subsequent stages, and the pass length is changed by moving the compensator rolls 119 and 120 up and down.

In the gravure printing machine, the plate cylinder itself also serves as a drive roll. In other words, the base material and the plate cylinder are gripping,
The characteristics of the plate cylinder itself differ greatly from those of other rotary presses by feeding the base material, and are characterized by the following points.

Since the plate cylinder and the substrate are gripped,
The angle of the plate cylinders, ie the relative angle between the plate cylinders, is not a direct printing register.

Therefore, in the static tension balance state, the relative phase between the plate cylinders becomes the printing register, but in the transitional time, the tension of the base material controls the printing register.

As shown in FIG. 12, the substrate tension of a constant path length between the nip rolls has a first-order lag whose time constant is the path passage time. Therefore, the printing register of the gravure printing machine also changes with the first-order lag of this time constant, and the base material is transmitted to subsequent stages one after the other, so it will interfere with the second-order lag, the third-order lag, and the higher-order lag. . That is, in FIG. 12, the path length between the plate cylinders = L (m), the substrate speed = v (m / sec),
Assuming that the tension of the inflowing substrate = Ti, the tension T ₀ (t) between the passes after Δt seconds is expressed by the following mathematical expression 1.

[0009]

[Equation 1]

If the above expression 1 is divided by Δt and Δt approaches 0 as much as possible, it can be expressed by the following expressions 2 and 3.

[0011]

[Equation 2]

[0012]

[Equation 3] That is, the tension T ₀ (t) is a first-order lag of the time constant obtained by dividing the path length L by the speed v.

By the way, in the gravure printing machine, since the printing register is directly influenced by the tension, the printing control is also different from other rotary printing machines as follows.

A. As for the printing registration, the absolute positions of all colors are monitored in other rotary presses, whereas in the gravure printing machine, as shown in FIG. 13, a combination of a mark sensor and a controller provided in each of the second and subsequent stages is used. Controls the relative position between the two colors with respect to the preceding printing unit.

B. Then, the correction of the gravure printing register is continuously added by the error feedback.

[0016]

As is clear from the above description, in the gravure printing machine, the plate cylinder grips the base material and also serves as a feed roll. Therefore, even if the relative angle between the plate cylinders is changed, the base material expands and contracts, so that the printing register does not change immediately, but the printing register moves due to the subsequent change in tension. In other words, the tension of the substrate dominates the printing register.

The fluctuation in tension between the printing rolls changes with a first-order lag whose time constant is the time taken for the base material to pass through, and is transmitted to subsequent stages one after another. Will be interfering with the delay.

In the sectional drive of the gravure printing machine, the printing register is corrected by operating the phase of the plate cylinder. However, when the relative phase is operated, the tension of the substrate on the input side and the output side of the operated plate cylinder is changed. become. Although the print register moves due to this change in tension, the change in tension of the substrate interferes with the print unit in the subsequent stage, and the print register in the subsequent stage is deviated.

Further, even in the conventional printing register control apparatus using the compensator roll, the tension fluctuation is transmitted to the latter stage and interferes with the latter stage printing in order to change the tension of the substrate on the entrance side of the plate cylinder. In the operation of the plate phase of the sectional drive, not only the tension on the inlet side but also the tension on the outlet side are changed at the same time, which directly interferes with the subsequent printing.

Therefore, in a sectional drive for correcting the register by operating the plate phase, it is considered that the operation amount is added to the operation amount in the subsequent stage to keep the apparent path length constant. However, there are many free rolls such as a dryer and a cooling roll between the printing rolls of the gravure printing machine, and these moments of inertia become a delay factor that cannot be ignored in the change of the substrate tension. Therefore, if the operation amount is simply added to the subsequent stage, the actual change in tension and the timing of the operation of the subsequent printing rolls will not match, which will rather cause an error in the printing registration.

In view of the above problems, it is an object of the present invention to provide a control method and control device in a sectional drive type gravure printing machine which does not include a compensator roll, in which the phase operation of the printing roll does not interfere with the subsequent printing. To provide.

[0022]

A method of controlling a gravure printing machine according to an embodiment of the present invention is a gravure printing machine of a sectional drive type that does not include a compensator roll, and operates a plate phase according to register adjustment of a printing unit at a certain stage. Based on the fluctuation of the tension of the printing substrate and the corresponding registration error, that is, the model of the plate phase, the simulation is performed, and the feed-forward compensation is added to the printing control of the printing unit of the subsequent stage based on the simulation result to perform the printing of the subsequent stage. It is characterized by making the influence on the unit non-interfering.

In this control method, the model assumes that there is a free roll defined by the moment of inertia J between the printing units of the respective stages, the moment of inertia J, the certain stage and the next stage. It is configured on the basis of the path length between the printing units of the stage, the path length between the printing units of the next stage and the next stage, the speed of the printing substrate, the conversion constant of the tension with respect to the displacement, and the like.

In this control method, when the gravure printing machine is composed of three or more stages of printing units, 2
The model is configured in each stage of the printing unit after the stage, and each model is configured so that even when the plate phase is manipulated in a plurality of printing units, the operations of the succeeding stages are added in cascade to make them non-interfering. Connected.

According to another aspect of the present invention, there is provided a sectional drive type gravure printing machine which does not include a compensator roll, which is provided with a printing unit driven by at least three stages of motors, and has a motor driver of each stage of the printing unit. Is a speed command value, and in the second and subsequent printing units, the registration error and position detection value respectively obtained from the printing register detection system and the plate cylinder origin signal detection system attached to the printing substrate. In a gravure printing machine provided with a control system for correcting the speed command value based on the above, between the control systems of the printing units of each stage, the operation of the plate phase accompanying the register adjustment of the printing unit of the preceding stage is performed. The tension fluctuation of the printing substrate and the corresponding registration error, that is, the transfer model of the plate phase is configured and connected, and the transfer model between one stage and the next stage is Control apparatus for a gravure printing machine, characterized in that empower a feed-forward compensation to the control system of the printing unit of the next stage is provided.

Also in the present control apparatus, the transmission model assumes that there is a free roll defined by the moment of inertia J between the printing units of each stage, and the inertia moment J, the certain stage and the next stage. It is configured on the basis of the path length between the printing units of the second stage, the path length between the printing unit of the next stage and the printing unit of the next stage, the speed of the printing substrate, the conversion constant of the tension with respect to the displacement, and the like.

In this controller, the second stage and the third stage are also provided.
The operation model with respect to the plate cylinder of the second-stage printing unit obtained from the printing register detection system in the second-stage printing unit is input to the transmission model between the third-stage printing units. The feed angle compensation for correcting the operating angle of the third-stage printing unit with respect to the plate cylinder, which is obtained from the printing register detection system in FIG. The transfer model of the transfer model is feedforward-compensated by the operating angle of the printing unit of the step with respect to the plate cylinder obtained from the detection system of the printing register in the printing unit of the step and the transfer model of the preceding stage of the step. To the plate cylinder of the printing unit of the next stage obtained from the detection system of the printing register in the printing unit of the next stage. It is cascaded configured to provide an angle for correcting the operation angle to a feed forward compensation.

[0028]

In the control method and the control device according to the present invention, the fluctuation of the tension of the substrate due to the operation of the plate phase and the corresponding registration error, that is, the model of the plate phase is constructed, and when the plate phase is operated, it is sent to the subsequent stage. Simulate the effect of. The result is compensated for feedforward compensation in the control of the plate cylinder in the subsequent stage, thereby canceling the influence of the change in tension and making the printing in the subsequent stage non-interfering with the plate phase operation.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION First, in order to facilitate understanding of the present invention, a description will be given of the influence of register correction on the plate phase, that is, the influence on the next stage accompanying the phase angle operation.

The case of the plate cylinders 1U to 3U of the first to third stage printing units will be described with reference to FIG. Path length L
_In order to correct the register between the _1-2U plate cylinders 1U and 2U, the phase angle of the plate cylinder 2U is moved by θ _CMP2 . Substrate 1
When the phase angle is operated in the direction of 0, the tension of the substrate 10 between the plate cylinders 1U and 2U increases by Td to (T ₀ + Td), but the plate cylinders 2U and 3U with the path length L _2-3U. On the contrary, the tension of the base material 10 between them decreases to (T ₀ -Td) and directly affects the printing registration between the plate cylinders 2U and 3U.

Next, as shown in FIG. 5, only two gripped feed rolls (combination of a plate cylinder and an impression cylinder), that is, no free roll between two feed rolls _having a path length L _2-3U is considered. If the plate cylinder 2U has a phase angle of θ
_When only _CMP2 is operated, operating angle of plate cylinder 3U θ _adj31
Is the cylinder 2 by moving the same amount as θ _CMP2 at the same timing.
The path length between U-3U does not change, and tension fluctuation does not occur.

However, as shown in FIG. 6, the plate cylinder 2U-3 has a path length L1 from the plate cylinder 2U and a path length L2 from the plate cylinder 3U.
When the inertia moment J due to the free roll exists in the path between U, the operation angle θ _adj31 of the plate cylinder 3U needs to be delayed with respect to θ _CMP2 .

The present invention has been made with the above points in mind, and employs the following method.

FIG. 7 shows the moment of inertia J in FIG.
Assuming that the tension between the free roll and the plate cylinder 3U is constant at T ₀ , a block diagram of a model in which the displacement of the free roll with respect to the operation angle θ _CMP2 of the plate cylinder 2U is θ _J is shown. Needless to say, the free roll displacement θ _J obtained here
_Is the operating angle θ _{adj31 of the plate cylinder} 3U, the tension between the free roll and the _{plate cylinder} 3U, that is, the tension on the entrance side of the _{plate cylinder} 3U is constant at T ₀ . In this block diagram, K1 is the displacement of the plate cylinder 2U, that is, the constant of the base material tension with respect to the change of the path length L1 between the plate cylinder 2U and the free roll, J is the moment of inertia of the intermediate free roll, and D is the viscosity coefficient of the base material. s is the Laplace operator, and ω _J is the angular velocity of the free roll.

From this, the displacement of the free roll with respect to the operating angle θ _CMP2 of the plate cylinder 2U, that is, the operating angle θ _{adj31 of the} plate cylinder 3U.
Becomes θ _J which is obtained by the equation 4, therefore, if the plate cylinder 3U is operated by giving three parameters of the tension conversion constant K1 to the displacement, the free roll inertia moment J and the viscosity coefficient D, the interference with the plate cylinder 3U is obtained. Can be canceled.

The displacement of the free roll with respect to the front operating angle is expressed by the following equation 4.

[0037]

[Equation 4]

Next, the entry side of the plate cylinder 2U of operating the phase angle by register adjustment, i.e. the tension variation between the plate cylinder 1U-2U path length L _1-2U in FIG. 4 of the path length L _2-3U Edition 2U-
The influence on the tension between 3U is modeled to prevent interference with the plate cylinder 3U.

Referring also to FIG. 8, the operating angle θ of the plate cylinder 2U
_{For CMP2} , the tension between plate cylinders 1U-2U also fluctuates. The tension fluctuation Td between the plate cylinders 1U and 2U with respect to the operation angle θ _CMP2 of the plate cylinder 2U is expressed by the following expression 5.

[0040]

[Equation 5]

However, K2 represents the conversion constant of tension with respect to the operating angle, and v represents the substrate speed. L _1-2U / v represents a time constant at which the base material 10 is exchanged between the passes of the _{plate cylinders} 1U and 2U.

The substrate 10 having the tension obtained by the equation 5 is the plate cylinder 2U.
And affects the tension between the plate cylinders 2U and 3U and interferes with the printing of the plate cylinder 3U. The tension fluctuation Td1 between the plate cylinders 2U and 3U is also obtained by the following formula 6 of the first-order delay having a time constant of L _2-3U / v at which the base material 10 passes between the passes.

[0043]

[Equation 6]

Since the tension fluctuation Td1 between the plate cylinders 2U and 3U is obtained, the inverse of the displacement / tension constant K2 used in equation 5 is multiplied and the phase angle of the plate cylinder 3U is manipulated. Two
The interference due to the tension fluctuation Td between U can be canceled. The change in tension between the passes in this case is naturally influenced by the inertia moment J of the free roll, but can be ignored because the time constants L _1-2U / v and L _2-3U / v for passing between the passes are large.

[0045] by superimposing FIGS. 7 and 8 as in Figure 9, the computing unit 91 the theta _CCL3 (operation angle theta _Adj31 obtained by the simulation of the model with respect to the operation angle _{θ CMP2} θ adj32 The value that has been corrected in (1) is added to the phase angle of the plate cylinder 3U to perform feedforward compensation, so that the influence on the plate cylinder 3U when the phase angle of the plate cylinder 2U is manipulated is canceled.

Actually, there are a plurality of printing units (three or more)
Therefore, the functions in FIG. 9 are connected in cascade according to the number of stages. That is, the phase angle operation for register correction is continuously performed in each printing unit, and the units are connected while being added, as shown in FIG.

FIG. 3 is a control system of the second and third stages of the control system when the present invention is applied to the gravure printing machine including the printing units of the first to fourth stages based on the above principle. The main configuration of the above is shown. As a matter of course, it is assumed that the free roll having the inertia moment J exists between the printing units of the second stage and the third stage, as described in FIG. Hereinafter, it is assumed that the first to fourth printing units are provided with the plate cylinders 1U to 4U, respectively.

In FIG. 3, for the transfer model M _2U between the second and third printing units, the plate cylinder 1U-
1-2U register correction signal between 2U (indicating operating angle θ _CMP2 )
Is given, the angle θ _CCL3 is obtained. Further, in order to cancel the interference due to this, the operation angle θ explained in FIG.
_The angle θ _CCL3 obtained by the transmission model M _2U at the time of operating the plate cylinder 2U with _CMP2 is fed to the 2-3U register correction signal (indicating the operation angle θ _CMP3 ) between the plate cylinders 2U and 3U by the calculator A _31. After being added as a forward compensation, the operation angle of the third-stage printing unit to the plate cylinder 3U is given as a 3U position correction θ _OP3 . Incidentally, K _2U in transfer model M _2U of Fig. 3 is a conversion constant tension with respect to the operation angle theta _CMP2 of the second stage. Needless to say, the lower block in the transmission model M _2U is a _combination of two blocks for obtaining the angle θ _{adj32 in} FIG. 9.

Similarly, in the fourth-stage printing unit
Operation angle θ for plate cylinder 4U_CMP3Based on 3U
Transmission model M at work_3UAngle θ obtained by_CCL4Play
Calculator A₄₁Due to this, 3-4U registration correction message between plate cylinders 3U-4U
No. (Operating angle θ_CMP4, With feedforward compensation
Then, the operation angle to the plate cylinder 4U is corrected by 4U position θ
_OP4Given as. The transmission model M_3UAt K
_3UIs the operating angle θ of the third stage _CMP3Is the conversion constant of the tension to
L_3-4UIs the path length between the plate cylinders 3U-4U. Less than,
The control system of the next and subsequent stages is also similarly configured.

As is apparent from the above description, the present invention is
For example, when operating the plate cylinder 2U of the second-stage printing unit, if the behavior of the third-stage printing unit to the plate cylinder 3U is equivalent to the transfer model from the beginning, correction is performed before the registration error occurs, that is, feedforward. The focus is on the fact that the registration error can be suppressed by compensation.

Next, with reference to FIG. 1, a description will be given of the overall configuration when the present invention is applied to a gravure printing machine including three or more printing units. Here, for convenience, the first
Although the printing units from the third stage to the third stage are shown, the printing units of the fourth stage and thereafter have substantially the same configuration as the printing units of the third stage.

In FIG. 1, in the first-stage printing unit 10, a speed command value from a speed command device (not shown) is given to the driver 11, and the driver 11 rotates the motor 12 based on the speed command value. Then, the power of the motor 12 is transmitted through the power transmission mechanism 13 so that the plate cylinder 1
4 is rotationally driven. The rotation amount of the motor 12 is the encoder 1
5, the encoder 15 outputs a pulse signal as a velocity feedback value when the encoder 15 is an incremental encoder. An impression cylinder 16 is pressed against the plate cylinder 14, and a printing substrate (hereinafter, referred to as a substrate) between the plate cylinder 14 and the plate cylinder 14 is provided.
00 is conveyed. The plate cylinder 14 is provided with an origin signal, which is detected by the origin sensor 17. The position detection counter 18 continues to count the pulses from the encoder 15, and is reset by the signal from the origin sensor 17.
An incremental or absolute encoder is used for the encoder 15. In the case of the incremental encoder, the count value of the position detection counter 18 is treated as a signal indicating the rotation amount of the motor 11, in other words, the reference position of the plate cylinder 14. In the case of the absolute encoder, the detection value of the encoder 15 is directly treated as the reference position. Here, the system including the encoder 15, the origin sensor 17, and the position detection counter 18 acts as a detection system of the origin signal. This also applies to the second and subsequent stages.

Next, in the second-stage printing unit 20, the power of the motor 22 is transmitted through the power transmission mechanism 23 to rotationally drive the plate cylinder 24. The rotation amount of the motor 22 is detected by the encoder 25, and in the case of an incremental encoder, a pulse signal is output as a speed feedback value. An impression cylinder 26 is pressed against the plate cylinder 24 to convey the base material 200 between the plate cylinder 24 and the plate cylinder 24. The plate cylinder 24 is also provided with an origin signal, which is detected by the origin sensor 27. The position detection counter 28 continues to count pulses when the encoder 25 is incremental, and is reset by a signal from the origin sensor 27. Encoder 25
Is an incremental encoder, the count value of the position detection counter 28 is treated as a signal indicating the amount of rotation of the motor 22, in other words, position feedback. In the case of an absolute encoder, the detected value of the encoder 25 is directly used as position feedback. This feedback position can be regarded as the position feedback of the second stage printing unit 20, and the difference from the reference position (output of the position detection counter 18) in the first stage printing unit 10 described above is regarded as the phase feedback. be able to.

The reference position from the position detection counter 18 of the first-stage printing unit 10 and the feedback position from the position detection counter 28 of the second-stage printing unit 20 are summed by the computing unit 34, so that the relative position, that is, the phase. Is calculated. The second-stage printing unit 20 further includes a base material 2
00, a mark sensor 31 for detecting a printing register is provided, and its output is given to a printing error detector 32. Then, the register regulator 33 outputs a register correction signal indicating the operation angle θ _CMP2 based on the printing error detected by the printing error detector 32. The operation angle θ _CMP2 becomes the 2U position correction θ _op2 for the second stage printing unit 20. This 2
The U position correction θ _op2 is further summed with a set value from a phase setter (not shown) in the calculator 35, and then the calculator 3
The output of 4 and the output of the calculator 35 are summed by the calculator 36 to calculate the phase error. The result of this calculation is the integrator 37
The integrated value is added as a correction value to the speed command value by the calculator 38, and the integrated value is integrated by the driver 2 of the second-stage printing unit.
Given to 1. Here, the system including the mark sensor 31, the register error detector 32, and the register regulator 33 functions as a print register detection system. This also applies to the third and subsequent stages.

The register correction signal indicating the operating angle θ _CMP2 is also
It is also given to the transmission model 60. The transmission model 60 corresponds to the transmission model M _2U described in FIG. 3, and outputs the angle θ _CCL3 for canceling the interference.

In the third-stage printing unit 50, the power of the motor 52 is transmitted through the power transmission mechanism 53 to rotate the plate cylinder 54. The rotation amount of the motor 52 is detected by the encoder 55, and in the case of an incremental encoder, a pulse signal is output as a speed feedback value. An impression cylinder 56 is pressed against the plate cylinder 54 to convey the base material 200 between the plate cylinder 54 and the plate cylinder 54. The plate cylinder 54 is also provided with an origin signal, which is detected by the origin sensor 57. The position detection counter 58 continues counting pulses when the encoder 55 is incremental, and is reset by a signal from the origin sensor 57. When the encoder 55 is an incremental encoder, the count value of the position detection counter 58 is treated as a signal indicating the rotation amount of the motor 52, that is, the position feedback. In the case of an absolute encoder, the detection value of the encoder 55 is directly used as position feedback. This feedback position can be regarded as the position feedback of the third-stage printing unit 50, and the difference from the reference position (output of the position detection counter 18) in the first-stage printing unit 10 described above is regarded as the phase feedback. be able to.

The reference position from the position detection counter 18 of the first-stage printing unit 10 and the feedback position from the position detection counter 58 of the third-stage printing unit 50 are summed by the computing unit 74, whereby the relative position, that is, the phase. Is calculated. The second-stage printing unit 50 further includes a base material 2
00, a mark sensor 71 for detecting the printing register is provided, and the output thereof is given to the printing error detector 72. Then, the register regulator 73 outputs a register correction signal indicating the operation angle θ _CMP3 based on the printing error detected by the printing error detector 72. The operation angle θ _CMP3 is summed by the calculator 79 to the angle θ _CCL3 from the transmission model 60, and becomes the 3U position correction θ _op3 for the third-stage printing unit 50. In this 3U position correction θ _op3 , the set value from a phase setter (not shown) is further summed by the calculator 75, and subsequently the output of the calculator 74 and the output of the calculator 75 are calculated.
And the phase error is calculated. The result of this calculation is integrated by the integrator 77, and this integrated value is added as a correction value to the speed command value by the calculator 78 and given to the driver 51 of the third-stage printing unit.

A transmission model 80 between the third stage and the fourth stage
Corresponds to the transmission model M _3U described with reference to FIG. 3, and this transmission model 80 has the operation angle operation angle θ as described with reference to FIG.
By giving _CMP3 and the 3U position correction θ _op3 , the angle θ _CCL4 for canceling the interference from the preceding stage can be obtained.

FIG. 2 shows a main configuration in which a transmission model 90 of the fourth stage is further added to the transmission models of the second and third stages shown in FIG. In Figure 3, it is shown in summarized form in one of the lower blocks in each transfer model, in FIG. _{2 L 1-2U / v = T 1-2U} , L 2- 3U / v = T 2- _3U , L _3-4U /
Two blocks are shown as in FIG. 9 where v = T _3-4U and L _4-5U / v = T _4-5U . K _T is the tension conversion constant to the displacement, L _4-5U is the path length between the plate cylinder 4U-5U, v is the printing speed, D is represents each coefficient of viscosity. Further, in FIG. 2, the thick line portion shows the feedforward compensation portion.

[0060]

As described above, in the control method and the control apparatus according to the present invention, the tension variation of the printing substrate by the operation of the plate phase and the corresponding registration error, that is, the transfer model of the plate phase is configured. The effect of tension change is canceled by simulating the influence on the subsequent stage when operating the plate phase, and feed-forward compensation of the result to the control of the subsequent plate cylinder to cancel the influence of the tension change, and the printing on the latter stage for the plate phase operation. Can be made non-interfering.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a gravure printing machine according to the present invention for first to third printing units among a plurality of printing units.

FIG. 2 is a diagram showing a configuration and a connection relationship of second to fourth stage transmission models which are main parts of the present invention in the gravure printing machine of FIG.

FIG. 3 is a diagram showing a configuration and a connection relationship of a transmission model in the second-stage and third-stage printing units according to the present invention.

FIG. 4 is a diagram for explaining tension fluctuations of a printing substrate before and after a phase operation of a second stage printing unit in a gravure printing machine.

FIG. 5 is a diagram for explaining a fluctuation in tension of the printing substrate between the second stage and the third stage during the phase operation of the second stage printing unit when there is no free roll between the printing units.

FIG. 6 is a diagram for explaining the tension fluctuation of the printing substrate before and after the free roll during the phase operation of the second-stage printing unit when there is a free roll between the printing units.

FIG. 7 is a block diagram showing a displacement model with respect to a plate cylinder operating angle in the front stage of the free roll shown in FIG.

FIG. 8 is a diagram for explaining a model of an influence of the latter stage due to a change in the tension of the printing substrate during the position operation of the former plate cylinder in the configuration shown in FIG. 6;

FIG. 9 is a diagram for explaining a model of an influence on a rear stage at the time of operating the position of the front plate cylinder in the configuration shown in FIG. 6;

FIG. 10 is a diagram for explaining the principle of gravure printing.

FIG. 11 is a diagram showing a general configuration of first to third stage printing units in the gravure printing machine.

FIG. 12 is a diagram for explaining the tension of the printing substrate between the plate cylinders in the gravure printing machine.

FIG. 13 is a diagram for explaining register control in the gravure printing machine.

[Explanation of symbols]

M _2U , M _3U , 60, 80, 90 Transmission model 10, 20, 50 1st stage, 2nd stage, 3rd stage printing unit 12, 22, 52 Motor 14, 24, 54 Plate cylinder 15, 25, 55 Encoder 16, 26, 56 Pressure cylinder 17, 27, 57 Origin sensor 31, 71 Mark sensor

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Claims (6)

[Claims] 1. In a sectional drive type gravure printing machine which does not include a compensator roll, a tension fluctuation of a printing substrate and a corresponding registration error, that is, a plate phase, due to an operation of the plate phase accompanying the register adjustment of a printing unit of a certain stage. A gravure printing machine characterized in that the effect on the subsequent printing unit is made non-interfering by adding a feedforward compensation to the printing control of the subsequent printing unit based on the simulation result Control method. 2. The control method according to claim 1, wherein the model includes a moment of inertia J between printing units of respective stages.
Assuming that there is a free roll defined by, the moment of inertia J, the path length between the printing unit of the one stage and the next stage, the printing unit of the next stage and the printing unit of the next stage A control method for a gravure printing machine, characterized in that it is configured on the basis of the path length, the speed of the printing substrate, and the conversion constant of tension with respect to displacement. 3. The control method according to claim 2, wherein when the gravure printing machine comprises three or more printing units, the model is constructed in each of the second and subsequent printing units, A control method for a gravure printing machine, wherein each model is connected so that, even when the plate phase is manipulated in a plurality of printing units, the subsequent operations associated therewith are cascaded to make them decoupling. 4. A sectional drive type gravure printing machine which does not contain a compensator roll, wherein
Equipped with a printing unit driven by the motor of each stage, the speed command value is given to the motor driver of each printing unit
In the second and subsequent printing units, the speed command value is calculated based on the registration error and the position detection value obtained from the printing register detection system attached to the printing substrate and the plate cylinder origin signal detection system, respectively. In a gravure printing machine equipped with a control system for correction, between the control system of the printing unit of each stage, the tension fluctuation of the printing substrate by the operation of the plate phase accompanying the register adjustment of the printing unit of the preceding stage and A corresponding registration error, that is, a transfer model of plate phase is constructed and connected, and the transfer model between one stage and the next stage is feed-forward compensated for its output to the control system of the printing unit of the next stage. A control device for a gravure printing machine, characterized by being provided as. 5. The control device according to claim 4, wherein the transmission model assumes that there is a free roll defined by the inertia moment J between the printing units of each stage, and the inertia moment J, Based on the path length between the printing unit of the one stage and the next stage, the path length between the printing unit of the next stage and the next stage, the speed of the printing substrate, the conversion constant of the tension with respect to the displacement, etc. A control device for a gravure printing machine characterized by being configured. 6. The control device according to claim 5, wherein the transfer model between the second-stage and third-stage printing units is a second model obtained from the printing register detection system in the second-stage printing unit. The operation angle with respect to the plate cylinder of the three-stage printing unit is input, and an angle for correcting the operation angle with respect to the plate cylinder of the third-stage printing unit, which is obtained from the detection system of the printing register in the third-stage printing unit, is set. The transfer model, which is given as feed-forward compensation, between the printing units of a certain stage after the third stage and the printing units of the next stage is obtained from the printing register detection system in the printing unit of the certain stage. The operation angle with respect to the plate cylinder and the feed-forward-compensated angle of the transfer model of the preceding stage of the certain stage are input, and the angle in the printing unit of the next stage is input. A gravure printing machine having a cascade connection configuration so as to provide an angle for correcting an operating angle of the printing unit of the next stage with respect to the plate cylinder obtained from a register detection system as feedforward compensation. Control device.